This first one where Jeremy is already in 250miles. X is the amount of time.
Step-by-step explanation:
Recall that

Therefore,

so


Answer:
25.5 days
Step-by-step explanation:
Mean number of days (μ) = 22 days
Standard deviation (σ) = 6 days
Z-score for the 72nd percentile (according to tabulated values) = 0.583
The z-score for any number of days, X, is determined by:

The value of X that is greater than 72% of the trial times is:

Therefore, 72% of all of these types of trials are completed within 25.5 days.
Circumference
C=2πr
C=2(3.14)(7)
C=(3.14)(14)
C=43.96